Overvoltage analysis of transmission towers considering the influence of tower-footing impedance

Araújo, Anderson Ricardo Justo de; Seixas, Claudiner Mendes de; Kurokawa, Sérgio; Kordi, Behzad

doi:10.1109/sipda.2017.8116938

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…The theories are either based on the circuit [7][8][9] or transmission-line formulations [10][11][12][13][14]. Full-wave electromagnetic modelling, using numerical techniques are based on finite element method (FEM) [15][16][17][18], method of moments [19][20][21][22], finitedifference time-domain method [23][24][25], and partial electric equivalent circuit [26,27]. These methods can be considered as the most rigorous and accurate modelling procedures over a wide frequency range.…”

Section: Introductionmentioning

confidence: 99%

High frequency response of grounding electrodes: effect of soil dielectric constant

Salarieh

Silva

Kordi

2020

IET Generation, Transmission & Distribution

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Grounding electrodes have an important role in electric power transmission and distribution systems. They are used to prevent excessive hazardous voltages due to ground potential rise in the case of system faults or lightning surges. The electrical properties of soil, which vary substantially with geographical location and time of year, affect the process considerably along with the properties of the grounding electrode itself, such as its dimensions. To have an accurate estimation of the induced overvoltages due to lightning strike, one has to take into account the effect of the value of the soil electrical parameters, such as the electrical conductivity and dielectric constant. This study investigates the high frequency behaviour of the grounding electrodes by solving a full-wave electromagnetic problem using the finite element method. The focus of this paper is on the effect of the variation of soil relative permittivity on the induced transient voltage in grounding electrodes. This allows an evaluation of the response of grounding systems due to seasonal changes, which would cause its electrical properties to vary significantly. This study demonstrates the importance of considering the variation of relative permittivity of the soil especially in the modelling of electrodes buried in highly resistive soil.

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Section: Introductionmentioning

confidence: 99%

High frequency response of grounding electrodes: effect of soil dielectric constant

Salarieh

Silva

Kordi

2020

IET Generation, Transmission & Distribution

Self Cite

View full text Add to dashboard Cite

show abstract

“…The theories are either based on the circuit [7][8][9] or transmission-line formulations [10][11][12][13][14]. Full-wave electromagnetic modeling, using numerical techniques are based on Finite Element Method (FEM) [15][16][17][18], Method of Moments (MOM) [19][20][21][22], Finite-Di erence Time-Domain (FDTD) method [23][24][25], and Partial Electric Equivalent Circuit (PEEC) [26,27]. These methods can be considered as the most rigorous and accurate modeling procedures over a wide frequency range.…”

Section: Introductionmentioning

confidence: 99%

On the High Frequency Response of Grounding Electrodes: Effect of Soil Dielectric Constant

Salarieh¹,

Silva²,

Kord³

2020

Preprint

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Section: Introductionmentioning

confidence: 99%

On the High Frequency Response of Grounding Electrodes: Effect of Soil Dielectric Constant

Salarieh¹,

Silva²,

Kord³

2020

Preprint

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<div><b>"This paper is a postprint of a paper submitted to and accepted for publication in IET Generation, Transmission & Distibution (GTD) and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at the IET Digital Library."</b></div><div><b><br></b></div><div><b>Abstract:</b><br></div><div>Grounding electrodes have an important role in electric power transmission and distribution systems. They are used to prevent excessive hazardous voltages between metallic structures and ground in the case of system faults or lightning surges. It is important that they provide a low impedance path for the current in to the ground. The electrical properties of soil, which vary substantially with geographical location and time of year, affect the process considerably along with the properties of the grounding electrode itself, such as its dimensions.</div>In order to have an accurate estimation of the developed overvoltages and the backflashover rate of the transmission lines due to a lightning strike, one has to take into account the effect of the value of the soil electrical parameters, such as the electrical conductivity and dielectric constant.<br>This paper investigates the high frequency behavior of the grounding electrodes by solving a full-wave electromagnetic problem using the Finite Element Method (FEM). The focus is on taking into account the effect of the variation of soil relative permittivity which has been neglected in the previous studies of the grounding systems. This allows an evaluation of the response of grounding systems due to seasonal changes and specifically change of the water content of the soil, which would cause its electrical properties to vary significantly. This study<br>demonstrates the importance of considering the variation of relative permittivity of the soil especially in the modeling of electrodes buried in highly resistive soil.<br>

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Overvoltage analysis of transmission towers considering the influence of tower-footing impedance

Cited by 4 publications

References 20 publications

High frequency response of grounding electrodes: effect of soil dielectric constant

High frequency response of grounding electrodes: effect of soil dielectric constant

On the High Frequency Response of Grounding Electrodes: Effect of Soil Dielectric Constant

On the High Frequency Response of Grounding Electrodes: Effect of Soil Dielectric Constant

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